Riding lawn mower



FIG. 1 is a left, front perspective view of a riding lawn mower, showing our new design;

FIG. 2 is a right, front perspective view thereof;

FIG. 3 is a right, rear perspective view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a left side perspective view thereof;

FIG. 6 is a front perspective view thereof;

FIG. 7 is a rear perspective view thereof;

FIG. 8 is a right side perspective view thereof. 

The ornamental design for a riding lawn mower, as shown and described. 